Doesn't make much difference in my opinion. Whichever way is easiest to apply the whole strip is good as far as I'm concerned.
One thing I do prefer however is the type of veneer stripping. I've used both the iron on type and the use your own white glue type. I believe the use your own glue type holds better. It takes longer to install and having some edge clamps makes the work go a lot faster. However, the iron on type is easier to use. Both types work well and hold fine.